Approximate parts cost for the BOM above for 1 board (incl inductors) works out ~€6 or so. So I still need to check to see if that is incl or excl VAT (sales tax) and customs etc etc. But suffice to say the parts for 1 stereo board ain't gonna cost that much. I also need to estimate postage costs from me back out to the various countries with/without tracking. Based on past experience I'd image we are looking at ~€12-13 for the full kit for one stereo board minus tracking which usually adds €3-4.